With his evolved Stand powers, Jotaro is able to defeat Kakyoin, an assassin sent by DIO. He takes the wounded Kakyoin back to his house, hoping to get some information about DIO from him and Joseph notices a flesh bud on his head. A flesh bud is something that DIO uses to control his followers.
You said that's the reason he swore loyalty to DIO?
هل قلتَ أنّ هذا هو السبب الّذي جعلَه يقسمُ الولاءَ لديو؟
Das ist der Grund
für seine Loyalität zu Dio?
¿Dices que esta es la razón por 
la que le juró lealtad a Dio?
¿Dices que esta es la razón por 
la que le juró lealtad a Dio?
C’est à cause de ça
qu’il serait soumis à Dio ?
Foi isso que o fez jurar lealdade ao Dio?